MPL 20x3x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020130
GTIN/EAN: 5906301811367
length
20 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.9 g
Magnetization Direction
↑ axial
Load capacity
2.33 kg / 22.90 N
Magnetic Induction
370.68 mT / 3707 Gs
Coating
[NiCuNi] Nickel
0.394 ZŁ with VAT / pcs + price for transport
0.320 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical parameters of the product - MPL 20x3x2 / N38 - lamellar magnet
Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020130 |
| GTIN/EAN | 5906301811367 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 3 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 0.9 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.33 kg / 22.90 N |
| Magnetic Induction ~ ? | 370.68 mT / 3707 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| remenance Br [min. - max.] ? | 12.2-12.6 | kGs |
| remenance Br [min. - max.] ? | 1220-1260 | mT |
| coercivity bHc ? | 10.8-11.5 | kOe |
| coercivity bHc ? | 860-915 | kA/m |
| actual internal force iHc | ≥ 12 | kOe |
| actual internal force iHc | ≥ 955 | kA/m |
| energy density [min. - max.] ? | 36-38 | BH max MGOe |
| energy density [min. - max.] ? | 287-303 | BH max KJ/m |
| max. temperature ? | ≤ 80 | °C |
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
| properties | values | units |
|---|---|---|
| Vickers hardness | ≥550 | Hv |
| Density | ≥7.4 | g/cm3 |
| Curie Temperature TC | 312 - 380 | °C |
| Curie Temperature TF | 593 - 716 | °F |
| Specific resistance | 150 | μΩ⋅cm |
| Bending strength | 250 | MPa |
| Compressive strength | 1000~1100 | MPa |
| Thermal expansion parallel (∥) to orientation (M) | (3-4) x 10-6 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Physical modeling of the product - report
Presented information represent the result of a mathematical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.
Table 1: Static force (pull vs gap) - characteristics
MPL 20x3x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3700 Gs
370.0 mT
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
warning |
| 1 mm |
2103 Gs
210.3 mT
|
0.75 kg / 1.66 lbs
752.3 g / 7.4 N
|
safe |
| 2 mm |
1172 Gs
117.2 mT
|
0.23 kg / 0.52 lbs
233.7 g / 2.3 N
|
safe |
| 3 mm |
721 Gs
72.1 mT
|
0.09 kg / 0.20 lbs
88.5 g / 0.9 N
|
safe |
| 5 mm |
345 Gs
34.5 mT
|
0.02 kg / 0.04 lbs
20.3 g / 0.2 N
|
safe |
| 10 mm |
101 Gs
10.1 mT
|
0.00 kg / 0.00 lbs
1.7 g / 0.0 N
|
safe |
| 15 mm |
42 Gs
4.2 mT
|
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
|
safe |
| 20 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
| 30 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Shear force (vertical surface)
MPL 20x3x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
|
| 1 mm | Stal (~0.2) |
0.15 kg / 0.33 lbs
150.0 g / 1.5 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.10 lbs
46.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
18.0 g / 0.2 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 20x3x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.70 kg / 1.54 lbs
699.0 g / 6.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 20x3x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
|
| 1 mm |
|
0.58 kg / 1.28 lbs
582.5 g / 5.7 N
|
| 2 mm |
|
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
|
| 3 mm |
|
1.75 kg / 3.85 lbs
1747.5 g / 17.1 N
|
| 5 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 10 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 11 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 12 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
Table 5: Working in heat (material behavior) - power drop
MPL 20x3x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
OK |
| 40 °C | -2.2% |
2.28 kg / 5.02 lbs
2278.7 g / 22.4 N
|
OK |
| 60 °C | -4.4% |
2.23 kg / 4.91 lbs
2227.5 g / 21.9 N
|
|
| 80 °C | -6.6% |
2.18 kg / 4.80 lbs
2176.2 g / 21.3 N
|
|
| 100 °C | -28.8% |
1.66 kg / 3.66 lbs
1659.0 g / 16.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 20x3x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
5.06 kg / 11.17 lbs
4 866 Gs
|
0.76 kg / 1.67 lbs
760 g / 7.5 N
|
N/A |
| 1 mm |
3.01 kg / 6.64 lbs
5 705 Gs
|
0.45 kg / 1.00 lbs
452 g / 4.4 N
|
2.71 kg / 5.97 lbs
~0 Gs
|
| 2 mm |
1.64 kg / 3.61 lbs
4 205 Gs
|
0.25 kg / 0.54 lbs
245 g / 2.4 N
|
1.47 kg / 3.24 lbs
~0 Gs
|
| 3 mm |
0.89 kg / 1.97 lbs
3 106 Gs
|
0.13 kg / 0.29 lbs
134 g / 1.3 N
|
0.80 kg / 1.77 lbs
~0 Gs
|
| 5 mm |
0.31 kg / 0.67 lbs
1 816 Gs
|
0.05 kg / 0.10 lbs
46 g / 0.4 N
|
0.27 kg / 0.61 lbs
~0 Gs
|
| 10 mm |
0.04 kg / 0.10 lbs
690 Gs
|
0.01 kg / 0.01 lbs
7 g / 0.1 N
|
0.04 kg / 0.09 lbs
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 lbs
202 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
24 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
14 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
9 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
6 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
5 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
3 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MPL 20x3x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (cracking risk) - collision effects
MPL 20x3x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
51.34 km/h
(14.26 m/s)
|
0.09 J | |
| 30 mm |
88.88 km/h
(24.69 m/s)
|
0.27 J | |
| 50 mm |
114.74 km/h
(31.87 m/s)
|
0.46 J | |
| 100 mm |
162.27 km/h
(45.08 m/s)
|
0.91 J |
Table 9: Corrosion resistance
MPL 20x3x2 / N38
| Technical parameter | Value / Description |
|---|---|
| Coating type | [NiCuNi] Nickel |
| Layer structure | Nickel - Copper - Nickel |
| Layer thickness | 10-20 µm |
| Salt spray test (SST) ? | 24 h |
| Recommended environment | Indoors only (dry) |
Table 10: Electrical data (Flux)
MPL 20x3x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 748 Mx | 17.5 µWb |
| Pc Coefficient | 0.32 | Low (Flat) |
Table 11: Submerged application
MPL 20x3x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.33 kg | Standard |
| Water (riverbed) |
2.67 kg
(+0.34 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.
3. Temperature resistance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32
This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.
Material specification
| iron (Fe) | 64% – 68% |
| neodymium (Nd) | 29% – 32% |
| boron (B) | 1.1% – 1.2% |
| dysprosium (Dy) | 0.5% – 2.0% |
| coating (Ni-Cu-Ni) | < 0.05% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Advantages and disadvantages of rare earth magnets.
Pros
- Their strength remains stable, and after around 10 years it decreases only by ~1% (according to research),
- Magnets effectively protect themselves against demagnetization caused by external fields,
- The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnetic induction on the working part of the magnet is strong,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Due to the possibility of accurate shaping and adaptation to custom needs, magnetic components can be manufactured in a variety of forms and dimensions, which makes them more universal,
- Wide application in future technologies – they serve a role in magnetic memories, drive modules, advanced medical instruments, and other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Limitations
- At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Limited possibility of making nuts in the magnet and complex forms - recommended is cover - magnetic holder.
- Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical when they are in the body.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Magnetic strength at its maximum – what contributes to it?
- using a sheet made of high-permeability steel, functioning as a ideal flux conductor
- whose thickness is min. 10 mm
- with a surface perfectly flat
- under conditions of no distance (metal-to-metal)
- under axial force vector (90-degree angle)
- in neutral thermal conditions
Key elements affecting lifting force
- Distance – the presence of foreign body (rust, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Chemical composition of the base – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
- Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.
Safety rules for work with neodymium magnets
Medical interference
Warning for patients: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.
Protective goggles
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Finger safety
Large magnets can smash fingers instantly. Under no circumstances put your hand betwixt two strong magnets.
Avoid contact if allergic
Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.
Caution required
Use magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their force.
Dust explosion hazard
Powder produced during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Data carriers
Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).
Swallowing risk
Always keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.
Phone sensors
Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and GPS.
Operating temperature
Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
